Android Question Google Maps, Firebase Services and google-services.json

I need to get Google Maps into my apps (B4A 6).

I used to do it with:

• Google Play Services < 30
• Google Maps library version 1.01
• Google Maps API Project Key in wich I specified several Android packages

I want to use Google Maps with the new schema (B4A 6+, Google Maps Library 2.0 and Firebase Services). I went through the tutorial with no problem.

Now I want to make an app on my own, but I don't understand the relationship between a Firebase Services project and the Android packages.

A) Shall I generate one Firebase project and attach only one Andorid package to it?, or
B) Can I use one project and agregate many packages to it?

I ask this because the B aproach generates the google-services.json file with all the packages, and I don't know if that is correct, since the file must reside in the poroject directory, and it would have references to packages that have nothing to do with.

Regards.